Find the odd word pair out from the given options.

The logic followed here is: In all the pairs, the 1st word represents the name of instrument used for measuring the 2nd word.   Ammeter : Current → An ammeter is used to measure current. Odometer : Speed → An odometer is used to measure speed. Hygrometer : Humidity → A hygrometer is used to measure the humidity. Anemometer : Pressure → Anemometer is used to measure winds. Pressure is measured by using a barometer.   Thus, ‘Anemometer : Pressure’ is the odd one out. Hence, the correct answer is (D).